Recent content by Simebone

  1. Simebone

    1978 XS650E "Shakey" Build Log

    I took the head, cylinders and pistons into machine shop and had them check the parts against the specs in the Yamaha shop manual. I was told that everything looked ok and that it'll be fine with just the new rings. I also had him hone the cylinders for me. $20. I installed the rings myself...
  2. Simebone

    1978 XS650E "Shakey" Build Log

    Back on the road with 1000km on the rebuld. (Since Sept. 20) New rings, seals and chain guide. I used a straw to install the valve stem seals and copper spray on the head gaskets. I replaced the rubber washers on the valve cover with copper washers all rounds. No leaks, no smoke, no oil...
  3. Simebone

    Fresh(ish) rebuild, smoked out the neighborhood

    The exact same thing happened to me. The smoke, the oil leaking out of the left exhaust. I'm putting it back together for the third time. New rings, gaskets and valve seals. Pistons cylinders and heads checked by a machine shop. No idea if it's going to fix it.
  4. Simebone

    1978 XS650E "Shakey" Build Log

    Thanks for the reply!
  5. Simebone

    1978 XS650E "Shakey" Build Log

    Measurements updated to prior post:
  6. Simebone

    1978 XS650E "Shakey" Build Log

    Took apart the engine again to take some measurements and see if there is any apparent cause. Cam chain guide looking rough: Head gasket looked great. The copper spray made a great seal that was easy to clean off with brake cleaner. No oil here. The pistons looks good. No scratches, nice and...
  7. Simebone

    1978 XS650E "Shakey" Build Log

    Thanks. The bike isn't running well, so I'm reluctant to warm the motor and risk further damaging it. Oil leaks out of the right exhaust header, and sprays oil and a plume of white smoke out of the exhaust pipes when running. I have to assume cold compression is worse than warm, so these...
  8. Simebone

    1978 XS650E "Shakey" Build Log

    Compression test: Cold engine, sitting for 2 days. Carbs off. Exhaust headers off. Both plugs out. 10 kicks with the kick starter Left: 60 90 110..140 Right:60 85, 100..138 Left max ( kicked until stopped rising):140 Right max (kicked until stopped rising):142
  9. Simebone

    1978 XS650E "Shakey" Build Log

    Everything's together, and the bike started on the first couple cranks! Except now oil is leaking out of the exhaust the engine is misfiring and I can't get advance. I've actually made it worse. FML. It may be time to cut my losses here.
  10. Simebone

    1978 XS650E "Shakey" Build Log

    The cylinder deck looked alright to me (I didn't take it in), but I did use a straight edge and a flashlight and there seemed to be a slight convexity around the cam chain tunnel (less then 0.10mm checked with my feeler gauge), otherwise it looked pretty darn good. Last night I lapped the...
  11. Simebone

    1978 XS650E "Shakey" Build Log

    I took my cylinder head into a machine shop to check for warping, the head is straight and doesn't need to be skimmed. The intake valves had a nice shiny metal ring where they sat, however the exhaust valves were covered in a lot of carbon, as were the valve seats. This seems to help explain...
  12. Simebone

    1978 XS650E "Shakey" Build Log

    This Sunday I pulled the motor to take a look at what's causing my oil consumption. I started with a compression test: (Cold) Left 110, Right 90. I planned on checking warm, but the bike wouldn't start (Great!) Then I connected a compressor to the engine to see if I could hear air escaping. TDC...
  13. Simebone

    Yamabond vs Permatex copper spray for head gasket installation

    Thanks for the feedback! I was leaning towards the copper spray as it seems to me that it would be easier to apply.
  14. Simebone

    Yamabond vs Permatex copper spray for head gasket installation

    Thanks for the reply. I had done a rebuild 2 weeks ago replacing most seals north of the cylinders. The cylinders were clean, with no visible marking and had a compression of 152psi in each cylinder. The cams and lifters were very clean with no visible marks or wear spots. Cleaned valves and...
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